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The first in-the-wild UEFI bootkit bypassing UEFI Secure Boot on fully updated UEFI systems is now a reality

  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Endpoint, Network_Traffic
  • Last Updated: 2023-04-14
  • Author: Michael Haag, Splunk
  • ID: 8eb0e418-a2b6-4327-a387-85c976662c8f


The number of UEFI vulnerabilities discovered in recent years and the failures in patching them or revoking vulnerable binaries within a reasonable time window hasn’t gone unnoticed by threat actors. As a result, the first publicly known UEFI bootkit bypassing the essential platform security feature UEFI Secure Boot is now a reality. present the first public analysis of this UEFI bootkit, which is capable of running on even fully-up-to-date Windows 11 systems with UEFI Secure Boot enabled. Functionality of the bootkit and its individual features leads us to believe that we are dealing with a bootkit known as BlackLotus, the UEFI bootkit being sold on hacking forums for $5,000 since at least October 2022. (ESET, 2023) The following content aims to aid defenders in detecting suspicious bootloaders and understanding the diverse techniques employed in this campaign.


Name Technique Type
Windows BootLoader Inventory System Firmware, Pre-OS Boot Hunting
Windows Impair Defenses Disable HVCI Disable or Modify Tools, Impair Defenses TTP
Windows WinLogon with Public Network Connection Bootkit Hunting


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